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Here's a curious situation hopefully someone can shed some light on.

I have a D750, an obsolete D100 (metaphorically) gathering dust, and the following lenses:

  • AF Micro Nikkor 60mm 1:2.8 D lens = works fine on D750 and my obsolete D100

  • AF-S Nikkor 17-35mm 1:2.8 D lens = works fine on D100, used to work fine on D750 but now gives fEE error

  • AF Nikkor 80-200mm ED 1:2.8 D lens = works fine on D100, used to work fine on D750 but now gives fEE error

Have cleaned contacts of each lens. Have of course locked the aperture ring of each lens while attempting to clear the fEE error on the D750. No luck. So I turned the sub-command dial off, and bingo (sort-of).

  • AF-S Nikkor 17-35mm 1:2.8 D lens + aperture ring option selected in f Controls submenu = no fEE error but aperture cannot be changed from f22 (that is, moving aperture ring does nothing)

  • AF Nikkor 80-200mm ED 1:2.8 D lens + aperture ring option selected in f Controls submenu = no fEE error but aperture cannot be changed from f22 (that is, moving aperture ring does nothing)

Seems to me it must be a camera body issue, as the lenses work on my old D100, but what have I done to the D750 for it to start returning a fEE error? Mechanical damage?

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It's possible your D750 is physically damaged. It sounds like the Ai (aperture indexing) sensor is having problems.

Prior to your D lenses returning fEE errors, did you perhaps try to mount an older, non-Ai lens to your camera body? If you did that, you could have bent or damaged the Ai index tab or the Ai sensor.

First, check if the Ai index tab moves. With the lens off the body, locate the sensor tab as shown in the image below. You should be able to rotate it easily with your finger. It should go from the ~1:30 position (upper right) to about the 10:30 (upper left) position.

Location of Ai index lever on Nikon D750 body
Location of Ai index lever on Nikon D750 body (circled in red)

If it moves easily, then I would suspect the sensor that the lever connects to. Although the thread, 'D610 "fEE" error, camera or lens??' at nikonrumors.com, originated with a problematic D610, a later poster had a similar problem on their D750. Their problem was diagnosed as a faulty "Aperture F-FO Base Plate Unit":

I had the same issue on my Nikon D750. I checked the contacts, made sure that lenses (as I had this with more than one lens) is locked on highest aperture. I even changed the mode from command to focus ring (helped a bit, but I did not have full functionality).

So I took it to Nikon to be fixed.

There is a small ceramic part inside that is called "Aperture F-FO Base Plate Unit". It is fragile and easy to break. It can break from normal use, possible vibration going over speed bumps or if you knock your camera. In my case Nikon fixed it for me under warranty free of charge.

If they diagnose it as mechanical damage, they might refuse though - in such case (or if camera is out of warranty) you may purchase the part on ebay (make sure you purchase right part) and take it to local camera shop to be fixed.

The poster even linked to a YouTube video that shows how to remove and replace that part.

YouTube video showing how to remove and replace Aperture F-FO Base Plate Unit

  • When is Nikon going to join the 21st century and eliminate mechanical connections between lenses and camera bodies? – Michael C Jul 23 '18 at 6:42
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    @MichaelClark lol. My answer is 50% "tell me about it. I'm a Nikon guy, it's killing me. At least they finally started using electronic aperture recently". The other 50% is actually serious: probably as soon as they release their mirrorless FF mount (so-called "Z-mount" currently, but might change when the release is actually announced). I'm betting it will be announced later this year. And the camera world will be in unison: finally! – scottbb Jul 23 '18 at 6:46
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    It was on Roger Cicala's "Wish list for Santa" several years running and he finally gave up. Or maybe he just quit writing a wish list every Christmas... – Michael C Jul 23 '18 at 6:48
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    Who, Roger? No way LensGuruGod1 is on Santa's 'naughty' list! Some folks think Roger is Santa! – Michael C Jul 23 '18 at 6:51
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    Thank you, Scott, for the comprehensive reply to my question – I appreciate the time and effort involved. You were right – the Ai index tab was stuck at the 10.30 position. It will slide over to the 1.30 position – but it's not a smooth movement. But with the tab manually moved over to 1.30, both lenses previously returning a fEE error now work fine. Changing either lens requires manually rotating the tab back to the 1.30 positon, however, so it's a temporary solution until I can get it repaired. Thanks again for help. – Mack Jul 26 '18 at 1:06

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